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Will any charger work? I have some I use for charging cell phones. Most batteries are 3.7V so it should work.

Let him try all night and see if it reacts tomorrow. Just need a few moments and then try to complete charge by the conventional method.

I write the results later...

Let us know, lets hope it is only a charger issue.

It's alive, it's alive... (thanks linw for advice)

After a night of charging, the voltage is at 3.63V.

I think it was just a matter of great discharge. At the moment the entered the tablet for continue to charge normally.

Probably was the result of not following my own advice and leave in the 1-2% charge.

It is best to leave it at 10-15% to ensure proper voltage.

PD: The charger I use is very slow for a 3000mA battery, but it's better to use a fast charger, and the latter, either in reality, the end of the full charge the battery can overheat, reducing its lifetime.

That voltage is not right. You should ALWAYS use the correct charger for Lithium cells. This is not something to mess with as you can burn your house down if you don't. Google 'lithium fires' to see what I mean.

These btys are Lipos so ONLY use a Lipo charger to charge them. A Lipo charger will charge at 4.2V in its constant voltage phase. So, 3.63V is way too low. They should settle at over 4V.

Well battery label says 3.8V output.

And charger label says 2.8~8.7V 250mA for batteries between 200-3000mA. And YES is designed for a Lithium cell batteries, not Ni-Mh or similar. Don't worry. But it's important to mention.

I think that is ok, o not?

And the output of 3.63V is just for a 30% or less of battery capacity. But now I try to charge normally with proper charger of tablet, and try to get 100% (I hope).

I leave a few days for better analysis.